		var keyStr = "ABCDEFGHIJKLMNOP" +"QRSTUVWXYZabcdef" +"ghijklmnopqrstuv" +"wxyz0123456789+/" + "=";
		
		function encode64(input) {
		
			 var output = "";
			 var chr1, chr2, chr3 = "";
			 var enc1, enc2, enc3, enc4 = "";
			 var i = 0;
			 do
			 {
				 chr1 = input.charCodeAt(i++);
				 chr2 = input.charCodeAt(i++);
				 chr3 = input.charCodeAt(i++);
				 enc1 = chr1 >> 2;
				 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
				 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
				 enc4 = chr3 & 63;
				 if (isNaN(chr2)){
					 enc3 = enc4 = 64;
				 }else if (isNaN(chr3)){
					 enc4 = 64;
				 }
				 output = output +
				 keyStr.charAt(enc1) +
				 keyStr.charAt(enc2) +
				 keyStr.charAt(enc3) +
				 keyStr.charAt(enc4);
				 chr1 = chr2 = chr3 = "";
				 enc1 = enc2 = enc3 = enc4 = "";
			 } while (i < input.length);
			 
			 return output;
		   
		}